Gall photographs nature, and her subjects have ranged from gardens and bodies of water to this more recent series of caves and quarries. She is drawn to “earthy and moist, rocky and watery” sites, but her work underground began by accident when she was forced into a cave during a storm while hiking through the jungle in Vera Cruz State, Mexico. That adventure led to a three-year project exploring subterranean spaces around the world. As she said in her book on the subject, Subterranea: “that is when I began to comprehend that I had left the horizon behind and entered the inner outdoors, where known boundaries disappear and night and day somehow manage to coexist.”